PPC-ROI tracking using telephone sales only

is there a ready-made script/soft I can use to do this?

neuron

I have someone that does all their sales by phone, like many sites do, such as legal sites or real estate sites. They do have an online order/checkout page, but the majority are done by phone.

They want to track their ROI on PPC for phone sales. Is there an existing analytics package that will perhaps generate a unique coupon code for each site visitor coming from a PPC link, and then have the coupon codes collected over the phone for later integration with the tracking software?